org.gjt.sp.jedit.syntax.DisplayTokenHandler Maven / Gradle / Ivy
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This project aims to build a command line tool that can create
HTML view with syntax highlighted source code.
It uses Jedit syntax highlighting engine and support all languages that are supported in JEdit.
Which are currently: ActionScript, Ada 95, ANTLR, Apache HTTPD, APDL, AppleScript, ASP, Aspect-J, Assembly, AWK, B formal method, Batch, BBj, BCEL, BibTeX, C, C++, C#, CHILL, CIL, COBOL, ColdFusion, CSS, CVS Commit, D, DOxygen, DSSSL, Eiffel, EmbPerl, Erlang, Factor, Fortran, Foxpro, FreeMarker, Fortran, Gettext, Groovy, Haskell, HTML, Icon, IDL, Inform, INI, Inno Setup, Informix 4GL, Interlis, Io, Java, JavaScript, JCL, JHTML, JMK, JSP, Latex, Lilypond, Lisp, LOTOS, Lua, Makefile, Maple, ML, Modula-3, MoinMoin, MQSC, NetRexx, NQC, NSIS2, Objective C, ObjectRexx, Occam, Omnimark, Parrot, Pascal, Patch, Perl, PHP, Pike, PL-SQL, PL/I, Pop11, PostScript, Povray, PowerDynamo, Progress 4GL, Prolog, Properties, PSP, PV-WAVE, Pyrex, Python, REBOL, Redcode, Relax-NG, RelationalView, Rest, Rib, RPM spec, RTF, Ruby, Ruby-HTML, RView, S+, S#, SAS, Scheme, SDL/PL, SGML, Shell Script, SHTML, Smalltalk, SMI MIB, SQR, Squidconf, SVN Commit, Swig, TCL, TeX, Texinfo, TPL, Transact-SQL, UnrealScript, VBScript, Velocity, Verilog, VHDL, XML, XSL, ZPT
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/*
* DisplayTokenHandler.java - converts tokens to chunks
* :tabSize=8:indentSize=8:noTabs=false:
* :folding=explicit:collapseFolds=1:
*
* Copyright (C) 2003 Slava Pestov
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gjt.sp.jedit.syntax;
//{{{ Imports
import java.awt.font.FontRenderContext;
import java.util.List;
import javax.swing.text.Segment;
import javax.swing.text.TabExpander;
import org.gjt.sp.jedit.buffer.JEditBuffer;
/**
* Creates {@link Chunk} objects that can be painted on screen.
* @version $Id: DisplayTokenHandler.java 12504 2008-04-22 23:12:43Z ezust $
*/
public class DisplayTokenHandler extends DefaultTokenHandler
{
// don't have chunks longer than 100 characters to avoid slowing things down
public static final int MAX_CHUNK_LEN = 100;
//{{{ init() method
/**
* Init some variables that will be used when marking tokens.
* This is called before {@link JEditBuffer#markTokens(int, TokenHandler)}
* to store some data that will be required and that we don't want
* to put in the parameters
*
* @param styles
* @param fontRenderContext
* @param expander
* @param out
* @param wrapMargin
*/
public void init(SyntaxStyle[] styles,
FontRenderContext fontRenderContext,
TabExpander expander, List out,
float wrapMargin)
{
super.init();
x = 0.0f;
this.styles = styles;
this.fontRenderContext = fontRenderContext;
this.expander = expander;
// SILLY: allow for anti-aliased characters' "fuzz"
if(wrapMargin != 0.0f)
this.wrapMargin = wrapMargin += 2.0f;
else
this.wrapMargin = 0.0f;
this.out = out;
seenNonWhitespace = false;
endX = endOfWhitespace = 0.0f;
end = null;
} //}}}
//{{{ getChunkList() method
/**
* Returns the list of chunks.
* @since jEdit 4.1pre7
*/
public List getChunkList()
{
return out;
} //}}}
//{{{ handleToken() method
/**
* Called by the token marker when a syntax token has been parsed.
* @param seg The segment containing the text
* @param id The token type (one of the constants in the
* {@link Token} class).
* @param offset The start offset of the token
* @param length The number of characters in the token
* @param context The line context
* @since jEdit 4.2pre3
*/
public void handleToken(Segment seg, byte id, int offset, int length,
TokenMarker.LineContext context)
{
if(id == Token.END)
{
if(firstToken != null)
out.add(merge((Chunk)firstToken,seg));
return;
}
for(int splitOffset = 0; splitOffset < length; splitOffset += MAX_CHUNK_LEN)
{
int splitLength = Math.min(length - splitOffset,MAX_CHUNK_LEN);
Chunk chunk = createChunk(id,offset + splitOffset,splitLength,context);
addToken(chunk,context);
if(wrapMargin != 0.0f)
{
initChunk(chunk,seg);
x += chunk.width;
if(Character.isWhitespace(seg.array[
seg.offset + chunk.offset]))
{
if(seenNonWhitespace)
{
end = lastToken;
endX = x;
}
else
endOfWhitespace = x;
}
else
{
if(x > wrapMargin
&& end != null
&& seenNonWhitespace)
{
Chunk nextLine = new Chunk(endOfWhitespace,
end.offset + end.length,
getParserRuleSet(context));
initChunk(nextLine,seg);
nextLine.next = end.next;
end.next = null;
if(firstToken != null)
out.add(merge((Chunk)firstToken,seg));
firstToken = nextLine;
x = x - endX + endOfWhitespace;
end = null;
endX = x;
}
seenNonWhitespace = true;
}
}
}
} //}}}
//{{{ Private members
//{{{ Instance variables
private SyntaxStyle[] styles;
private FontRenderContext fontRenderContext;
private TabExpander expander;
private float x;
private List out;
private float wrapMargin;
private float endX;
private Token end;
private boolean seenNonWhitespace;
private float endOfWhitespace;
//}}}
//{{{ createChunk() method
private Chunk createChunk(byte id, int offset, int length,
TokenMarker.LineContext context)
{
return new Chunk(id,offset,length,
getParserRuleSet(context),styles,
context.rules.getDefault());
} //}}}
//{{{ initChunk() method
protected void initChunk(Chunk chunk, Segment seg)
{
chunk.init(seg,expander,x,fontRenderContext);
} //}}}
//{{{ merge() method
private Chunk merge(Chunk first, Segment seg)
{
if(first == null)
return null;
Chunk chunk = first;
while(chunk.next != null)
{
Chunk next = (Chunk)chunk.next;
if(canMerge(chunk,next,seg))
{
// in case already initialized; un-initialize it
chunk.initialized = false;
chunk.length += next.length;
chunk.width += next.width;
chunk.next = next.next;
}
else
{
if(!chunk.initialized)
{
initChunk(chunk,seg);
if(wrapMargin == 0.0f)
x += chunk.width;
}
chunk = next;
}
}
if(!chunk.initialized)
initChunk(chunk,seg);
return first;
} //}}}
//{{{ canMerge() method
private static boolean canMerge(Chunk c1, Chunk c2, Segment seg)
{
if(!c1.accessable || !c2.accessable)
return false;
char ch1 = seg.array[seg.offset + c1.offset];
char ch2 = seg.array[seg.offset + c2.offset];
return ((c1.style == c2.style)
&& ch1 != '\t' && ch2 != '\t'
&& (c1.length + c2.length <= MAX_CHUNK_LEN));
} //}}}
//}}}
}
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